Roof-square.



P. N. BERGGREN. ROOF SQUARE.

APPLICATION rum) MAR. 12. 1910.

i,O59,264. Patented Apr. 15, 1913.

Z0 WITIVESSES: Ill/VENTUR' I PErE/F Nflf/TGG/MM ,KQ/M y I By a afiffm 4 0 0 v 47g A TTORNEYS COLUMBIA PLANOORAIIH CO" WASHINGTON. I; G.

PETERJN'. BERGGREN, OFESANI JOSE, CALIFORNIA.

* ROOF-SQUARE.

Specification of Letters Patent; 1

Patented Apr. 15, 1913.

Application filed March 12, 1910. Serial No. 548,950.

To all whom, it may concern:

Be it knownthat LPMER N; BERGGREN, a citizen of the United States,and a resident of. San Jose, in: the county of Santa Clara and State of California, have made certain new and useful. Improvementsin Roof-Squares, of which] the following is a specification.

My invention. is an improvement in root squares, and consistsain .certain novel constructions, and combination of parts, herein: after described and claimed.

The object of. the invention is to provide a square especially fitted for roof work,;but equally'well adapted for any work wherein an ordinary or bevel: square may be used, and which will be easily manipulated to indicate the correct angle, and locked linzthe required position, and which .whennot 1n.

use may be folded into small compass.

Referring torthe drawings forming azpart hereof, Figure 1 .is.a side .vievvof the :im-. provement, showing the parts lllla position for bevel work, Fig. 2 Bis. a; similar: view showing it in use as an. ordinary square, Fig. 3.51s an edge; view, andFig, 4. is a section of the line H .of Fig.3.: The embodiment of the invention shown in :the drawings, comprises a handle. 1,1'which is provided at oneend with a pair of parallel longitudinalslots 2 and 2 and the. 013

posite end may be provided with a reinforcing ferrule 3, secured to :the handle by riv= ets 4:. a a

A substantially; ZI-shaped strip or blade is mounted in 30116 of jtheslots, the said blade comprising :a .body portion 5 which normally fits in the slot, andis of awidth corresponding to the width .of the handle, andthe body portion is providedat eachend withFa lateral extension 6 and 7 respectively.

The extensions project in opposite directions, the extension 6 *beingstraight and extending at a right angle to the bodyportion, while the extension 7 is are shaped, and the extension 6 is providedwith a scale 8, and the extension 7 with; a plurality of scales 9 and. 9 A. transverse opening; is provided in the body portion at :the junction of the extensionti therewith, and the extension 7 is struck on the; arc of ;a.circle,f.whose center is the opening.

A stem 10 passes; through: the opening and through registering openings in: the

handle on eachl side of .theslot, and. the

threaded ends of the stem extend on each side of the handle, and are engaged by wing nuts 11. A .reinforcingzplate 12 is let into each of the outer faces of thehandle at the end provided withthe :stem, and the wing nuts 11 screwagainst the plates.

The swinging movement of the blade 5 ;is limited in. one direction by a pin 13'extending. tl'lrough the handle, and adapted toengage a nick 14 in the edge of the blade, and the stem 10 is provided at its center with a collar 15, which fits within an openinglG in the handle, and is retained in place on the stern by a transverse pin 17.

A second strip or blade 18 is provided at one end with an opening through which the stem 10 extends, and the said blade re ceived in the slot 2, The opposite or free.

'end. of the blade is beveled! as shown at 19,

and the inner end of the slot is similarly: beveled! as shown at 20, to fit the end of the blade, andthe handlelis provided .Wlthi a notch? 21, to permit access. to the blade to openthe same. i

It nvill be evident \fromthe description,

that either blade maybe moved into and out of its respective slot, and may be locked in any position whichit is capable of taking,

by means of the wing nut on that side. The arrangement of the collar at the center. of the stem, permits either wing. nut to be tightened, without interfering with? the other, and oneblade] maybe locked while the. other is free. i

It will be evident that manydifierent coni-. binations may be formed with the blades. As shown in.Fig. 2,.by locking the blade 5 with the extension 6 at. right angles to the a handle, a perfectly true square is provided,

and the scale on the arcshaped extension? indicates the angle of the extension .6 with respect to the handle.

The scale Q gives thecomplement of the angle between the body portion or blade5 and the handle, while the scale 9? gives the angle between; the body. portion: .or blade and the handle. Therscale 9 plus degrees gives the angle between the extension and the handle. For instance, in the .position shown in; Fig. 1, the body portion or blade =51is at an anglerof 40 degreeswith respect to the handle, and the said complement of the angle between the said blade 5 andthe handle is .50 degrees. The angle. between :the extension 6 and the handle is 130 degrees, that 40 degrees plus 90 degrees.

The bladeils y also be use -11 0mm- I t-ion with thescale on the arc-shaped bar,

and when the extension 7 'is in. the position.

shown inFig. 2, the upper series of numerals will indicate the angle the said blade'plS handle as shown ig. 1, to act as an in:

dicator for the scale, when the. handle is of soft material, such as wood. It will be understood .that the handle may be of metal, however, if desired, in which case the reinforcing plates etc. will be dispensed with.

When folded the device requires but little more roomthan the ordinary square, and it will be evident that it may be made of any desired size.

The. extension 6 may also be used in cooperation with the blade 18, as shown in Fig. 1, and the extension 7' may'be'used to lay off curved lines.

'I claime- 1 1. Adevice of the character specified, comprisinga' handle having at one end two parallel longitudinal slots, a. blade in each first extension.

slot, a stem extending j through the said end of the handle and through' the blades,

angled lateral extension at the end adja- ..cent to the. stem, and at the other .end an and having each end threaded, a wing nut v(lured to the stem between the blades, the handle having. an opening to receive the collar, one of said blades having; a right, 2

arc-shaped lateral extension extending in the opposite direction from the first extension, each of said extensidns havinga' scale, the other blade havingiits free end beveled. 2, A device of the eharacter specified colnprising a handle havingat. one end two: p r- 7 allel longitudinal slots, a blade in each slot,

a stem extending through the said end of the handle and through the blades, and having each end threaded, a wingnut engaging each s end of the stem,means intermediate the blades for anchoring the stem, one of said blade having its free endw b eveled, and other having at each end a lateral extension, the extension at the free end of the blade being arc-shaped and struck .on the arc of a circle,

whose center is the stem, the other extension being at right angles to the blade and exg tending in the opposite direction from the PETER. N. BERGGREN, lVitnessesz, l 1

JOHN LINnsT oM, L. .E. Linn e-N.

copies of this patent may be obtained for five c ents each, by addressing the Commissioner of Patents:

Washington, D. G. l 

